86 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
rounded, thin and simple; pillar stout, white, short, obliquely truncate in 
front; canal wide, short, slightly flaring; base somewhat constricted, with 
a spiral striae stronger than on the rest of the surface. Long., 40; aper¬ 
ture, 15 ; maximum diameter, 12 mm. Long, of shell, 40; of aperture, 15; 
max. diam., 12 mm. (Dali.) 
Type in United States National Museum, No. 122568. Type locality, 
off San Luis Obispo, California, in 252 fathoms. 
Range. Unimak Pass, Aleutian Islands, to San Diego, California. 
This was described as Pletirotoma ( antiplanes ) thalaca by Dali. 
Antiplanes bulimoides Dali, 1919 
Proceedings of the United States National Museum, 56:34; PI. 11, fig. 7. 
Shell elongate, decollate, whorls six or more, four distinctly remaining, 
suture distinct, not appressed, whorls moderately convex, smooth, with a 
pale, polished, greenish periostracum over a white substratum, in spots 
minutely granulose, apparently from some wrinkling of the periostracum; 
anal sulcus wide, shallow, hardly forming a fasciole; outer lip thin, sharp, 
moderately produced; inner lip with a thin white layer of callus; pillar 
straight, with an anterior oblique attenuation; canal wide, hardly differ¬ 
entiated. Length of three complete whorls, 31; of last whorl, 23; diameter 
at apex, 5; maximum diameter, 15 mm. (Dali.) 
Type in United States National Museum, No. 111051. Type locality, 
Station 4772, on Bowers Bank, Bering Sea, in 344 fathoms. 
Range. Bowers Bank, Bering Sea. 
Antiplanes abarbarea Dali, 1919 
Plate 3, fig. 6 
Proceedings of the United States National Museum, 56:35; PI. 9, fig. 5. 
Shell whitish, acute, with one globular nucleus and six and a half sub¬ 
sequent well-rounded whorls; suture distinct, not appressed; spiral 
sculpture of faint obscure grooves with wider interspaces over the whole 
spire but obsolete on the last whorl, and a series of faint, irregular periph¬ 
eral nodulosities on the upper part of the spire; axial sculpture of rather 
coarse, irregular, incremental lines, retractively arcuate in front of the 
suture, though there is no distinct fasciole; aperture elongate, anal sulcus 
close to the suture, rather deep; outer lip thin, smooth inside, inner lip 
erased; pillar straight, smooth, attenuated in front; canal short, wide, 
nearly straight. Height of shell, 21.5 ; of last whorl, 13.5 ; diameter, 8 mm. 
(Dali.) 
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